EP1888378A2 - Bumper assembly with energy absorber - Google Patents
Bumper assembly with energy absorberInfo
- Publication number
- EP1888378A2 EP1888378A2 EP06759207A EP06759207A EP1888378A2 EP 1888378 A2 EP1888378 A2 EP 1888378A2 EP 06759207 A EP06759207 A EP 06759207A EP 06759207 A EP06759207 A EP 06759207A EP 1888378 A2 EP1888378 A2 EP 1888378A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- transverse
- wall
- energy absorber
- bumper system
- accordance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/03—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by material, e.g. composite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
Definitions
- This invention relates generally to automobile vehicle bumpers, and more particularly, to energy absorbing vehicle bumper systems.
- FMVSS Federal Motor Vehicle Safety Standard
- some energy absorbing bumper systems attempt to reduce vehicle damage as a result of a low speed impact by managing impact energy and intrusion while not exceeding a rail load limit of the vehicle, hi addition, some bumper systems attempt to reduce pedestrian injury as a result of an impact.
- a bumper system typically includes a beam that extends widthwise across the front or rear of a vehicle and is mounted to rails that extend in a lengthwise direction.
- the beam typically is steel, and the steel beam is very stiff and provides structural strength and rigidity.
- some bumper systems also include shock absorbers.
- the efficiency of an energy absorbing bumper system, or assembly is defined as the amount of energy absorbed over distance, or the amount of energy absorbed over load.
- a high efficiency bumper system absorbs more energy over a shorter distance than a low energy absorber. High efficiency is achieved by building load quickly to just under the rail load limit and maintaining that load constant until the impact energy has been dissipated.
- shock absorbers sometimes are positioned, for example, between the steel bumper beam and the vehicle rails.
- the shock absorbers are intended to absorb at least some of the energy resulting from an impact. Adding shock absorbers to a bumper assembly results in an added cost and complexity as compared to a steel beam. The shocks also add weight to the bumper assembly, which is also undesirable since such added weight may reduce the overall fuel efficiency of the vehicle.
- Other known energy absorbing bumper systems include a W-shaped energy absorber. However, for beams with reduced heights, molding of W-shaped thermoplastic energy absorbers becomes infeasable.
- a bumper system for an automobile vehicle includes a beam configured to attach to the vehicle, and an energy absorber coupled to the beam.
- the energy absorber is tunable for meeting predetermined criteria for both low speed and pedestrian impacts and includes a frame portion and a body including a plurality of tunable crush lobes extending from the frame portion.
- Each crush lobe is longitudinally spaced apart from an adjacent crush lobe, and at least one crush lobe includes a first transverse wall, a second transverse wall spaced apart from the first transverse wall, a third transverse wall spaced apart from the second transverse wall, and a front wall coupled to the first and second transverse walls.
- the first, second, and third transverse walls extend from the frame portion and the second transverse wall is located between the first and third transverse walls.
- a bumper system for an automobile vehicle includes a beam configured to attach to the vehicle, a thermoplastic energy absorber coupled to the beam, the energy absorber being tunable for meeting predetermined criteria for both low speed and pedestrian impacts, and a fascia positioned and sized to envelop the beam and the energy absorber.
- the energy absorber includes a frame portion having a flange, and a body including a plurality of tunable crush lobes extending from the frame portion.
- Each crush lobe is longitudinally spaced apart from an adjacent crush lobe, and at least one crush lobe includes " a first transverse wall, a second transverse wall spaced apart from the first transverse wall, a third transverse wall spaced apart from said second transverse wall, and a front wall coupled to the first and second transverse walls.
- the first, second, and third transverse walls extend from the frame portion, and the second transverse wall is located between the first and third transverse walls.
- an energy absorber for a vehicle bumper system is provided.
- the energy absorber is tunable for meeting predetermined criteria for both low speed and pedestrian impacts and includes a frame portion and a body including a plurality of tunable crush lobes extending from the frame portion.
- Each crush lobe is longitudinally spaced apart from an adjacent crush lobe, and at least one crush lobe includes a first transverse wall, a second transverse wall spaced apart from the first transverse wall, a third transverse wall spaced apart from the second transverse wall, and a front wall coupled to the first and second transverse walls.
- the first, second, and third transverse walls extend from the frame portion and the second transverse wall is located between the first and third transverse walls.
- Figure 1 is an exploded perspective schematic illustration of a bumper assembly in accordance with an embodiment of the present invention.
- FIG 2 is a perspective schematic illustration of the energy absorber shown in Figure 1.
- Figure 3 is a sectional schematic illustration of the bumper assembly shown in Figure 1.
- Figure 4 is a sectional schematic illustration of a known bumper assembly.
- Figure 5 is a schematic illustration of a positional relationship between the bumper assembly shown in Figure 1 and a human leg.
- Figure 6 is a schematic illustration of a positional relationship between the known bumper assembly shown in Figure 4 and a human leg.
- an energy absorber of the non-foam type is attached to a beam.
- the beam is fabricated, for example, from steel, aluminum, or glass mat thermoplastic (GMT).
- the energy absorber in the example embodiment, is fabricated from Xenoy® material and is tunable so as to meet desired impact criteria, e.g., pedestrian and low speed impacts. More particularly, a front portion of the energy absorber is tuned, and tunable, to absorb pedestrian leg from impact, and a rear portion of the energy absorber is tuned, and tunable, for low speed barrier and pendulum impact.
- Impact forces during the specified types of impacts are maintained just below a predetermined level by deforming the energy absorber and beam until the kinetic energy of the impact event has been absorbed. When the impact is over, the energy absorber returns substantially to its original shape and retains sufficient integrity to withstand subsequent impacts.
- the bumper system is described below with reference to specific materials (e.g. Xenoy® material (commercially available from General Electric Company, Pittsfield, Massachusetts) for the energy absorber), the system is not limited to practice with such materials and other materials can be used.
- the beam need not necessarily be a steel, aluminum, or GMT compression molded beam, and other materials and fabrication techniques can be utilized.
- the energy absorber is selecting from materials that result in efficient energy absorption, and the beam materials and fabrication technique are selected to result in a stiff beam.
- FIG 1 is an exploded perspective view of one embodiment of a bumper system 20.
- System 20 includes an energy absorber 22 and a beam 24.
- Energy absorber 22 is positioned between beam 24 and a fascia 26 which, when assembled, form a vehicle bumper.
- beam 24 is attached to lengthwise extending frame rails (not shown).
- Fascia 26 typically is generally formed from a thermoplastic material amenable to finishing utilizing conventional vehicle painting and/or coating techniques. Generally, fascia 26 envelops both energy absorber 22 and reinforcing beam 24 such that neither component is visible once attached to the vehicle.
- Beam 24, in the example embodiment, is fabricated from extruded aluminum.
- beam 24 is fabricated from roll formed steel or a compression molded glass mat thermoplastic (GMT).
- GMT compression molded glass mat thermoplastic
- Beam 24 can have one of multiple geometries, including being configured as a B-section, a D-section, an I-beam, or having a C or W cross-sectional shape.
- the geometry of beam 24 is selected to provide a desired section modulus depending on the particular application in which the beam is to be used.
- Beam 24 includes rail attachment openings 28 so that bolts (not shown) can pass therethrough to secure bumper system 20 to the frame rails.
- Energy absorber 22 includes a frame portion 50 having first and second longitudinally extending flanges 52 and 54, respectively, which overlap beam 24.
- Absorber 22 further includes a body 58 that extends outward from frame portion 50. The specific configuration of body 58 is illustrated and described below in connection with Figures 2 and 3.
- energy absorber body 58 includes a plurality of crush lobes 60 extending from frame 50 between flanges 52 and 54.
- Each crush lobe 60 is spaced apart from each other and includes a first transverse wall 62 and a second transverse wall 64.
- Transverse walls 62 and 64 are rippled and include alternating raised areas 66 and depressed areas 68 which provide the transverse walls with an added degree of stiffness to resist deflection upon impact.
- Transverse walls 62 and 64 can further include a plurality of windows or openings 70. The width and depth dimensions of the ripples, as well as the dimensions of openings 70, can be modified to achieve different stiffness characteristics as desired.
- Each crush lobe 60 also includes a first side wall 72 and a second side wall 74.
- An outer wall 76 extends between the distal ends of transverse walls 62 and 64, and side walls 72 and 74.
- At least one of the plurality of crush lobes 60 also includes a third transverse wall 78 to form a crush lobe 80.
- crush lobe 80 has a substantially S-shaped cross-section.
- Third transverse wall 78 is located adjacent to and spaced apart from second transverse wall 64, but is not coupled to outer wall 76.
- Third transverse wall 78 similar to first and second transverse walls 62 and 64 is rippled and includes alternating raised areas 66 and depressed areas 68 which provide transverse wall 78 with an added degree of stiffness to resist deflection upon impact.
- Transverse wall 78 can also include a plurality of windows or openings 70.
- the width and depth dimensions of the ripples, as well as the shape and dimensions of openings 70, can be modified to achieve different stiffness characteristics as desired.
- suitable shapes for openings 70 include, but are not limited to, a rectangular shape, a square shape, a triangular shape, or a teardrop shape.
- Third transverse wall 78 enlarges the energy absorbing area of crush lobe 80 as compared to crush lobe 60.
- an area 82 located between fascia 26 and beam 24 has no support for a leg 84 (shown in Figure 6) during an impact event.
- third transverse wall 78 extends into area 82 and provides support for leg 84 (shown in Figure 5) in an impact event.
- a length A of leg 84 that is supported by crush lobe 80 is greater than a length B of leg that is supported by crush lobe 60 shown in Figure 6.
- side walls 72 and 74 and transverse walls 62, 64 and 78 vary linearly in thickness from a first front-most portion 88 to a rearmost portion 90.
- the wall thickness varies from about 1 millimeter (mm) to about 7 mm, in another embodiment, from about 1.5 mm to about 5 mm, and still another embodiment, from about 2.5 mm to about 3.5 mm.
- the thickness of the walls is constant from front-most portion 88 to rearmost portion 90 and is between about 1 mm to about 7 mm.
- the thickness of the walls are stepped. Particularly, the thickness of the walls of front-most portion 88 is constant and the thickness of the walls of rearmost portion 90 is constant with the walls of rearmost portion 90 thicker than the walls of front-most portion 88.
- Crush lobes 60 and 80 are tunable in that by selecting a thickness of each portion 88 and 90, the response of crush lobes 60 and 80 can be altered. For example, front portion 88 of crush lobes 60 and 80 is tuned, and tunaWe, to absorb pedestrian leg " form impact, and rear portion 90 is tuned, and tunable, for low speed and pendulum impact.
- Each crush lobe 60 and 80 can, of course, have any one of a number of different geometries depending on the impact energy requirements for the vehicle.
- Each crush lobe 60 and 80 has an axial crush mode in both barrier and pendulum impacts according to Federal Motor Vehicle Safety Standard (FMVSS) and also has a stiffness tunability in order to meet the desired impact load deflection criteria.
- FMVSS Federal Motor Vehicle Safety Standard
- thermoplastic resin Another aspect in appropriately tuning energy absorber 22 is the selection of the thermoplastic resin to be employed.
- the resin employed may be a low modulus, medium modulus or high modulus material as needed.
- the characteristics of the material utilized to energy absorber 22 include high toughness/ductility, thermally stable, high energy absorption capacity, a good modulus-to-elongation ratio and recyclability. While the energy absorbers may be molded in segments, the absorbers also can be of unitary construction made from a tough plastic material.
- An example material for the absorbers is Xenoy material, as referenced above. Of course, other engineered thermoplastic resins can be used.
- Typical engineering thermoplastic resins include, but are not limited to, acrylonitrile- butadiene-styrene (ABS), polycarbonate, polycarbonate/ AB S blend, a copolycarbonate-polyester, acrylic-styrene-acrylonitrile (ASA), acrylonitrile- (ethylene-polypropylene diamine modified)-styrene (AES), phenylene ether resins, blends of polyphenylene ether/polyamide (NORYL GTX® from General Electric Company), blends of polycarbonate/PET/PBT, polybutylene terephthalate and impact modifier (XENOY® resin from General Electric Company), polyamides, phenylene sulfide resins, polyvinyl chloride PVC, high impact polystyrene (HIPS), low/high density polyethylene, polypropylene and thermoplastic olefins (TPO).
- ABS acrylonitrile- butadiene-styrene
- Bumper assembly 20 permits better management of " deceleration, rotation, and shear during lower leg impact.
- Bumper assembly 20 permits the use of smaller height beams while properly distributing the load during impact.
- Crush lobes 80 provide for increased leg coverage height and facilitates meeting or exceeding government pedestrian safety requirements. While the invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/135,565 US7278667B2 (en) | 2005-05-23 | 2005-05-23 | Bumper assembly with energy absorber |
PCT/US2006/017530 WO2006127242A2 (en) | 2005-05-23 | 2006-05-05 | Bumper assembly with energy absorber |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1888378A2 true EP1888378A2 (en) | 2008-02-20 |
EP1888378B1 EP1888378B1 (en) | 2013-05-01 |
Family
ID=37447668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06759207.1A Not-in-force EP1888378B1 (en) | 2005-05-23 | 2006-05-05 | Bumper assembly with energy absorber |
Country Status (7)
Country | Link |
---|---|
US (1) | US7278667B2 (en) |
EP (1) | EP1888378B1 (en) |
JP (1) | JP2009501100A (en) |
KR (1) | KR101273067B1 (en) |
CN (1) | CN101720286B (en) |
AU (1) | AU2006249545A1 (en) |
WO (1) | WO2006127242A2 (en) |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60333131D1 (en) * | 2003-07-03 | 2010-08-05 | Netshape Energy Man Llc | BUMPER SYSTEM WITH THERMOFORMED ENERGY CONTAINER |
US8141918B2 (en) * | 2006-02-24 | 2012-03-27 | Honda Motor Co., Ltd. | Pedestrian bumper system and method |
CN101605677B (en) * | 2007-02-02 | 2012-09-19 | 沙普公司 | Energy absorber and its construction method, and bumper system |
FR2914601B1 (en) * | 2007-04-06 | 2009-07-10 | Plastic Omnium Cie | ASSEMBLY OF A SHOCK BEAM AND ABSORBER |
JP4815387B2 (en) * | 2007-04-25 | 2011-11-16 | 株式会社イノアックコーポレーション | Shock absorbing member |
KR101013901B1 (en) | 2007-12-18 | 2011-02-14 | 현대자동차주식회사 | Bumper Apparatus With Multi-Energy Absorbing Structure |
US8505990B2 (en) * | 2007-12-21 | 2013-08-13 | Sabic Innovative Plastics Ip B.V. | Corner energy absorber and bumper system |
US8016331B2 (en) | 2008-02-14 | 2011-09-13 | Shape Corp. | Energy absorber with sidewall stabilizer ribs |
US7866716B2 (en) | 2008-04-08 | 2011-01-11 | Flex-N-Gate Corporation | Energy absorber for vehicle |
US20090315346A1 (en) * | 2008-06-20 | 2009-12-24 | David William Schelberg | Bumper reinforcement extension |
US7806448B2 (en) * | 2008-11-04 | 2010-10-05 | Sabic Innovative Plastics Ip B.V. | Vehicle bumper system with energy absorber |
FR2949407B1 (en) * | 2009-08-26 | 2011-11-18 | Peugeot Citroen Automobiles Sa | BUMPER BRACKET AND BUMPER WITH CONTROLLED DEFORMATIONS. |
RU2012123392A (en) * | 2009-11-06 | 2013-12-20 | Шэйп Корп. | ENERGY ABSORBER WITH ACCESSORIES THAT MAKE A UNIFORM PEDESTRIAN SHOCK |
US8356857B2 (en) * | 2010-03-05 | 2013-01-22 | Shape Corp. | Hood pedestrian energy absorber |
US8480143B2 (en) * | 2010-12-10 | 2013-07-09 | Ford Global Technologies, Llc | Energy absorbing structure for vehicle bumper |
US8328251B2 (en) * | 2010-12-17 | 2012-12-11 | Sabic Innovative Plastics Ip B.V. | Asymmetric energy absorber and method of making and using the same |
US8424629B2 (en) | 2011-03-09 | 2013-04-23 | Shape Corp. | Vehicle energy absorber for pedestrian's upper leg |
KR101322475B1 (en) * | 2011-11-02 | 2013-10-29 | 이든텍 주식회사 | Energy absorber of vehicle |
US8876179B2 (en) | 2012-02-01 | 2014-11-04 | Sabic Global Technologies B.V. | Energy absorbing assembly and methods of making and using the same |
US9731669B2 (en) * | 2012-02-28 | 2017-08-15 | Sabic Global Technologies B.V. | Energy absorbing system |
US9033380B2 (en) | 2012-05-23 | 2015-05-19 | Sabic Global Technologies B.V. | Energy absorber with staggered, vertically oriented crush lobes |
US8973957B2 (en) | 2013-04-22 | 2015-03-10 | Shape Corp. | Bumper energy absorber with sensor and configured lobes |
USD776022S1 (en) | 2014-07-25 | 2017-01-10 | Sabic Global Technologies B.V. | Vehicle rail extension |
USD779397S1 (en) * | 2015-04-29 | 2017-02-21 | Sabic Global Technologies B.V. | Extension for an energy absorber |
US10065587B2 (en) | 2015-11-23 | 2018-09-04 | Flex|N|Gate Corporation | Multi-layer energy absorber |
USD820749S1 (en) | 2015-12-29 | 2018-06-19 | Sabic Global Technologies B.V. | Roof component for a motor vehicle |
JP6531662B2 (en) * | 2016-02-17 | 2019-06-19 | スズキ株式会社 | Front body structure |
CN106541919A (en) * | 2016-12-23 | 2017-03-29 | 河南奔马股份有限公司 | A kind of automobile buffer beam and bumper beneficial to protection pedestrian |
SE1750635A1 (en) * | 2017-05-22 | 2018-11-23 | Gestamp Hardtech Ab | Bumper beam with reinforcement patch |
US10618485B2 (en) | 2018-04-09 | 2020-04-14 | Ford Global Technologies, Llc | Vehicle energy absorber |
DE102018118658A1 (en) * | 2018-08-01 | 2020-02-06 | GEDIA Gebrüder Dingerkus GmbH | Bumper assembly for a motor vehicle |
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US3884455A (en) * | 1972-04-19 | 1975-05-20 | Mccord Corp | High efficiency energy absorber |
SE383128B (en) * | 1974-07-04 | 1976-03-01 | Saab Scania Ab | CELL BLOCK FOR SHOCK RECORDING |
DE3928060A1 (en) * | 1989-08-25 | 1991-02-28 | Daimler Benz Ag | BUMPER FOR A VEHICLE |
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DE19637512C2 (en) * | 1996-09-13 | 1999-11-11 | Daimler Chrysler Ag | Bumpers |
US5988713A (en) * | 1996-09-13 | 1999-11-23 | Daikyo Co., Ltd. | Bumper reinforcement |
US6199942B1 (en) * | 1998-02-04 | 2001-03-13 | Oakwood Energy Management, Inc. | Modular energy absorbing assembly |
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US6354641B1 (en) * | 1999-08-23 | 2002-03-12 | Daimlerchrysler Corporation | Automobile bumper retention system |
US6511109B1 (en) * | 2000-03-10 | 2003-01-28 | Plastech Engineered Products, Inc. | Bumper system for an automotive vehicle |
US6406081B1 (en) * | 2001-03-20 | 2002-06-18 | General Electric Company | Energy absorber system |
JP2005502521A (en) * | 2001-09-12 | 2005-01-27 | ゼネラル・エレクトリック・カンパニイ | Bumper beam and bumper assembly including bumper beam |
EP1441928B1 (en) * | 2001-10-29 | 2007-03-07 | General Electric Company | Bumper assembly including an energy absorber |
KR100812054B1 (en) * | 2001-10-29 | 2008-03-07 | 제너럴 일렉트릭 캄파니 | Bumper assembly including an energy absorber |
DE60333131D1 (en) * | 2003-07-03 | 2010-08-05 | Netshape Energy Man Llc | BUMPER SYSTEM WITH THERMOFORMED ENERGY CONTAINER |
US7163242B2 (en) * | 2005-01-05 | 2007-01-16 | General Electric Company | Bumper system with energy absorber |
-
2005
- 2005-05-23 US US11/135,565 patent/US7278667B2/en not_active Expired - Fee Related
-
2006
- 2006-05-05 KR KR1020077016507A patent/KR101273067B1/en not_active IP Right Cessation
- 2006-05-05 WO PCT/US2006/017530 patent/WO2006127242A2/en active Application Filing
- 2006-05-05 JP JP2008510291A patent/JP2009501100A/en not_active Withdrawn
- 2006-05-05 EP EP06759207.1A patent/EP1888378B1/en not_active Not-in-force
- 2006-05-05 CN CN2006800027794A patent/CN101720286B/en not_active Expired - Fee Related
- 2006-05-05 AU AU2006249545A patent/AU2006249545A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2006127242A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006127242A3 (en) | 2009-05-28 |
AU2006249545A1 (en) | 2006-11-30 |
US20060261611A1 (en) | 2006-11-23 |
EP1888378B1 (en) | 2013-05-01 |
US7278667B2 (en) | 2007-10-09 |
CN101720286B (en) | 2013-02-13 |
KR20080009044A (en) | 2008-01-24 |
WO2006127242A2 (en) | 2006-11-30 |
KR101273067B1 (en) | 2013-06-11 |
CN101720286A (en) | 2010-06-02 |
JP2009501100A (en) | 2009-01-15 |
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